Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ec4ea61668b5ae3…

MALICIOUS

PDF

74.8 KB Created: 2021-09-30 17:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b1c7b30eb7695e54e067c63a731722eb SHA-1: b2929e47b48b8eb357b46a3dc33d65b6dbcccb09 SHA-256: 1ec4ea61668b5ae363d0861f935082c8afd5b29fa5713e4fb5e6dee57280b51b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://charteriraq.ir/basefile/charteriraqir/files/pilomawesexuxoxep.pdf In PDF document text
    • http://shqinze.net/admin/upimg/file///nukuwe.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/wigedezebita.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/c2d4027684e7073c4ec112a1e669d916/lupano.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/65216351409.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210902232842.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1632777275goledidujopasetesavaw.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/7176544980.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/gavikubedubibolebepija.pdfIn PDF document text
    • https://aramlasmerok.hu/uploads/file/56044062588.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/85280073917.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/161447bffcf94f---34902241967.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/46303681612.pdfIn PDF document text
    • http://sswjeans.com/files/93379996636.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/71905374264.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/muramepavebal.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163271155983.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614234ab6e42d---44267055907.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/60321408003.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/88296508521.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/82200442358.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/29978177922.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613234bd722a8---fobufeva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=nirahua+hindustani+2+film+nirahua+hindustani+2+filmPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB80 10564 bytes
SHA-256: 29d48100c3b72270c0626eef708eb75a5fe9403ce3cf3626d30b13892c5a5c81
font_01_sfnt_off0000d361.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD361 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB73 19200 bytes
SHA-256: 9311a875f16c36c93d0b62582e03fe4933b40bbdc5cacfd612d96e84ede897d9